Fluid-pressure joint for pistons.



No. 644,807. Patented Mar a, I900.

R. c. SAVER. I

FLUID PRESSURE JOINT FOR PISTONS.

(Application filed Aug. 3, 1899.)

(No Model.)

Witnessw. Inventor.

Mirna ATENT OFFICE.

FLUlD-PRESSUREJOINT FOR PISTONS.

SPECIFICATION forming part of Letters Patent N 0. 644,807, dated March6, 1900.

Serial No. 726,045. (No model.)

To aZZ whom it may concern.-

Be it known that 1, ROBERT OooKE SAYER, a subject of the Queen of GreatBritain and Ireland, residing at Clyde road, RedlancLBristol, in thecounty of Gloucester, England, have invented certain new and usefulImprovements in Fluid-Pressure Joints for Pistons, (for which I havemade application for patent in Great Britain, No. 8,521, dated April 24,1899 and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

Thisinvention has for its object to utilize the pressure in the cylinderto prevent leakage past the piston 5 and it consists in causing thepressure to act on a split ring to expand it and force it and a packingagainst the surfaces to be packed.

In the accompanying sheets of illustrative drawings, Figure 1 isasection of a piston at a b on Fig. 2. Fig. 2 is a sectional plan at c d,Fig. 1. Fig. 3 is a diagrammatic view. Fi g. 4 is a diagrammatic view ofthe valves.

The pressure-cylinder 1 contains the piston 2, whose rod 3 passesthrough its glands 4:. The piston 2 has a chamber or space 5, in whichseats for valves 6 and 7, connected by the rod 8, are formed, so thatwhen one is open the other is. shut, also a space containing anexpanding joint orvessel 9, that ex pands, with a split ring 11connecting-With a passage 10, a hole 1% in the split ring 11, andpacking 12 in contact with the sides of the cylinder 1 and piston 2 andwith an annular space 13. It also connects with the pipe 17, Fig. 3,through the tubes 35 and 36, having hinges 37, 38, and 39. The tube 17contains the valves 18 and 19, like 6 and 7, connecting with chambers 15and 16, containing rams open to either end of the cylinder 1. The pipe17 has branches 20, with valves 21 and 22, connectin g with a reservoir23 of lubricant under pressure of a weight or spring 24 and ram.

The working is as follows: Pressure being admitted below the piston 2 itopens the valves 7, closes 6, acts against the ring 11 to thrust thepacking 12 against the sides of the cylinder 1, gives a pressure to theram and lubricant in its chamber 15, closes the valves 21 and 19, allowsthe lubricant to flow through valve 22, opens 18, passes to the passages17, 10, 9, 14, and 13, thrusts the packing 12 against the piston 2 andcylinder 1 and keeps it lubricated, the packing 12 preventing escape. Bythis construction when not required to be effective the friction of thepacking is minimized'.

In modification the valves 6 and 7 and vessel 9 are not used, but thelubricant from the reservoir 23 goes to the chamber 5 to act on the ring11, and by passages 14 and 13 act as above.

In both cases the fluctuations of the pressures in the cylinder arerepeated on the packings.

What I claim, and desire to secure by Letters Patent, is-

1. A cylinder, a ram connected to the cylinder, a lubricant-reservoirconnected to the ram, a valve between the reservoir and ram, hollowjointed links connected to the ram, a valve between the links and ram, ahollow piston-rod connected to the links, a piston with chamber workingin the cylinder, a groove around the piston and connected with thechamber and a packing in the groove.

2. A cylinder, a ram connected to the cylinder, a lubricant-reservoirconnected to the ram, a valve between the reservoir and ram,

hollow jointed links connected to the ram, a-

valve between the links and ram, a hollow

